[llvm-bugs] [Bug 34174] New: __stosb intrinsic handled incorrectly
via llvm-bugs
llvm-bugs at lists.llvm.org
Sat Aug 12 13:04:39 PDT 2017
https://bugs.llvm.org/show_bug.cgi?id=34174
Bug ID: 34174
Summary: __stosb intrinsic handled incorrectly
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedbugs at nondot.org
Reporter: ignacio.slipknot at gmail.com
CC: llvm-bugs at lists.llvm.org
__stosb should generate a "rep stosb" instruction.
In the current implementation, however, it creates a call to memset.
This is unacceptable when you need the exact behavior of this intrinsic.
One possible solution is to insert inline assembly like
clang/lib/Headers/intrin.h does, that way it shouldn't be optimized away.
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